I have a 95 car, it has a Scorpion 5000 Cat-1 alarm fitted. I was told that they cut into the loom, use all black wires and that you need the fob, ECU and receiver to make it work.
The fob is square and has 2 buttons, a black one for lock/unlock and a red one for PANIC , which just sets of the alarm from a distance to frighten off any near by attackers.
The ECU is installed behind the lower glove box, maybe from that you can see what manufacturer it is.
SO its best to replace the alarm then with remote locking facility? also the sellers on flea bay are selling basically useless junk,
Thanks for info.
Regards Mark